C(s)+O2(g)=CO2(g) ΔH1=-393.5kJ/mol
— H2(g)+1/2O2(g)=H2O(g) ΔH2=-242kJ/mol (题目中方程式书写错误,O2前的系数不对)
— CO(g)+1/2O2(g)=CO2(g) ΔH3=-283kJ/mol (同上,“—”就是方程反向后相加)
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C(s)+H2O(g)=H2(g)+CO(g) ΔH=ΔH1-ΔH2-ΔH3=-393.5+242+283=+131.5kJ/mol